We propose to measure camera angular speed \(\omega \)  given the camera parameters, frame rate \(N\)  and a single 3D look-at point \(\mathbf {a}\)  obtained by triangulating all cameras, following Nerfies [1]}.
Recall that \(\omega \)  is computed as the scaled expectation,
\(\omega =\mathop {\mathbb {E}}_{t,t+1 \in \mathcal {T}}\bigg [\arccos \Big (\frac{\langle \mathbf {a} - \mathbf {o}_t, \mathbf {a} - \mathbf {o}_{t+1}\rangle }{\Vert \mathbf {a} - \mathbf {o}_t\Vert  \cdot \Vert \mathbf {a} - \mathbf {o}_{t+1}\Vert }\Big )\bigg ]\cdot N.\) 
